Vat dye



Patented Apr. 21, 1925.

UNITED STATES -rn'ram OFFICE.

WILHELM' BAUER AND ALFRED HERRE, F OPLADEN, NEAR COLOGNE, GERMANY, AS-

' SIGNORS TO FARBENFABRIKEN- VORM. FBIEDR. BAYER AND 00., OF LEV'EBKUSEN,

NEAR GOLOGNE-ON-THE-RHINE, GERMANY.

var mm.

No Drawing.

To all whom it may concern.

Be it known that we, WILHELM BAUER and ALFRED HERRE, citizens of Germany, residing at Opladen, near Cologne, in the State of Pr'ussia, Germany, have invented new and useful Improvements in Vat Dyes,

of which the following is a specification.

Our invention relates to the manufacture and production of new and valuable vat I0 dyestuffs. They are obtained by treating with sulfurylchlorid the dyestufis which can be obtained by condensing beta-naphthisatin derivatives in which the oxygen of the alpha-keto gro'up is replaced by easily l6 moveable or replaceable substituents, e. g. halogen, sulfur, the animo group, the alkoxy group with 1- anthrol or their derivatives having a free orthoand paraposition to the hydroxy group. By, this 80 treatment with sulfurylchlorid the chlorine enters into the anthrol nucleus. u The new dyestuffs are after being dried dark blue crystalline owders soluble in hot nitrobenzene genera 1y with a blue (:01- 26 oration; and which yield with hydrosulfite and caustic soda sol'ution generally orangeyellow vats dyeing cotton after exposure'to air bluish-grey to black shades. These shades are bluer, deeper and faster to boil- 30 ing and to light as those obtained with the original dyes not treated with sulfurylchlorid. In order to illustrate 'the new process more fully the followin example is given,

7 a the parts being by weig 't,:-

Application filed may 19, 1923. Serial no. 640,225.

7 37, 3 parts of the dye obtained from betanaphthisatin-alpha-chloride and l-anthrol (see United States Letters Patent No. 1.005.141) are suspended in 500 parts of chlorobenzene and 14 parts of sulfurylchlorid are added to the suspension which is cooledand stirred. After the, addition of the sulfurylchlorid the temperature of the mixture is raised to. 70 C. The chlorination now takes place, which is accompanied by an evolution of s'ulfurous acid and hydrochloric acid. After the reaction is com plete it is allowed to cool, and the dye is filtered off and dried. It is a bluish-black crystalline powder soluble in concentrated sulfuric acid with a slate blue coloration.

' It forms an orange-brown vat with caustic soda solution and hydrosulfite whichdyes the textile fibre deep blue-black shades.

We claim The herein described new dyestufi c0n-' taining a beta-na hthisatin nucleus combined with a chlormated l-anthrol nucleus, which dye is a bluish-black powder soluble in concentrated sulfuric acid with a slate blue coloration; yielding an oran e-brown vat with caustic soda solution an 'hydrosulfite which dyes the textile fibre deep. blueblack shades, substantially as described.

In testimony whereof we have hereunto set our hands. a

'WILHELM BAUER. I ALFREDLBERRE. 

